Perennial herb, tufted, 0.4-1.7 m high. Leaf blades ± 300-500 x 6-11 mm, plicate; upper surface glabrous, lower surface papillate. Culm nodose, 3-angled, 1.5-3.0 mm in diam. Inflorescence a raceme of spikes, 115-650 mm long. Bracts 1 at each node, leaflike. Spikes (3-)6, erect or suberect, the largest 30-100 x 10-15 mm, upper 1-3 male, lower 1-4 female. Female bracts (glumes) ovate-lanceolate, 5-6 x 1.9-4.0 mm, keel excurrent into 0.7-2.0 mm long scabrid awn. Perigynium spreading, 6-7 x 2.5-3.0 mm, shallowly 3-angled in cross section, much inflated, green or stramineous, cartilaginous, glabrous, nervose; rostrum 1.0-1.5 mm long, apex deeply bidentate. Flowering time Sept.-Dec. Nutlet obovate, narrowly clawed, 2.8-3.5 x 1.7-2.5 mm, 3-angled, dark, minutely papillose.
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Tufted perennial to 1.7 m. Spikelets shiny brown.
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